Here are two outstanding color charts for normal fur:
https://hickoryridgehollands.com/holland-lop-color-guidehttp://www.gbfarm.org/rabbit/holland-colors.shtml
Here're my two cents...
Sable colors in general can be pretty tricky to identify since they have such a range of expression. Smoke pearl, which is a dilute black sable <aaB_cchl_ddE_>, usually looks a bit bluer (is that a word?), though not exactly blue. Your doe - on my screen - not only looks more sable than blue, but she also has a fairly brown body color. As
@ladysown points out, the chocolate is a little surprising since that takes both parents carrying <b> but since it's a recessive, that's always a possibility. Another possibility is that your doe is a
chocolate sable <aabbcchl_D_Ee>. That would be reasonable if she did produce a lynx (and might explain the color that I see on my screen).
So, to the question of producing a lynx from a chocolate sable (or smoke pearl) with a cinnamon (I'm assuming you are referring to what I know as tort <aaB-C-D-ee>) or an orange sire...Since choc sable and smoke pearl are both self colors, if the baby truly is a lynx, the sire must be orange; that would be the only place to get an agouti <A> to make lynx <A_bbC_ddE_>. And, whether or not the baby is lynx, if the buck produced chestnuts with the self doe, he
must be an orange.
The REW doesn't reallly tell you much other than that both parents have <c> in the second place on the C locus - which is why I included it below.
Y
our buck is NOT tort (cinnamon):
...Smoke pearl <aa B_ cchl c dd E_> x Tort <aa B_Cc D_ ee> = all selfs (so no lynx and no chestnut)
...Chocolate Sable <aa bb cchl c D_ E_> x Tort <aa B_Cc D_ ee> = all selfs (no lynx or chestnut)
Your buck IS orange:
...Smoke pearl <aa B_ cchl c dd E_> x Orange <A_ B_ Cc D_ ee> = agoutis and full color probable; chocolates, selfs, dilutes and/or non-extension colors possible (so you'd expect chestnuts and could get lynx)
...Chocolate Sable <aa bb cchl c D_ E_> x Orange <A_ B_ Cc D_ ee> = agoutis probable; chocolates, selfs, dilutes and/or non-extension colors possible (again, you'd expect chestnuts and could get lynx)
Note that many breeders like to breed chocolate-based (rather than black-based) oranges, because chocolate smut is less obvious than black smut. So it wouldn't be at all surprising if your orange buck carried chocolate.
As far as the photos of the babies of your buck x the orange doe, they look like creams to me <A_B_C_ddee>. That would suggest that both parents carry dilute, and both are non-extension (which you already know since that's what makes them orange).
One more wrench in the works: lynx <A_ddC_ddE_> is pretty easily confused with cream <A_B_C_ddee>, blue tort <aabbC_ddee> or lilac tort <aabbC_ddee>. This is especially true with brokens. The only way I've ever been able to be sure about those colors is to either know certain details about the pedigree (and trust that the colors have been correctly identified), or actually see the ring colors in the fur across the flanks/back of lynx; like oranges, the creams have only a surface color and an undercolor, no rings.
I have found that agoutis, especially the dilutes, take at least a few months for proper ring color to show up; it starts on the flanks and progresses across the back and shoulders last. So, since based on the parents' colors, your lynx bunny could be lynx, cream,
or tort, making the final call on color may be in the future.
BTW, I'd love to see the pedigrees on the orange buck and the smoke pearl (?) doe!